Madlenka's weight is at the 30th percentile. This means that 30 percent of all babies their age weigh less than they do, and the remaining percentage of babies weigh more than they do.
Let's break down the problem step-by-step:
1. Understanding Percentiles:
- The 30th percentile indicates a position in a data set where 30 percent of the observations fall below this point.
2. Percent of Babies Weighing Less:
- If Madlenka's weight is at the 30th percentile, then by definition, 30 percent of all babies their age weigh less than they do. Therefore, the first blank should be filled with 30.
3. Percent of Babies Weighing More:
- Since percentages must add up to 100 percent, we can subtract the 30 percent from 100 percent to find the percentage of babies that weigh more.
- [tex]\(100\% - 30\% = 70\%\)[/tex]
- Therefore, 70 percent of all babies their age weigh more than Madlenka.
Thus, the solution to the question is that 30 percent of all babies weigh less than Madlenka and 70 percent of all babies weigh more than Madlenka.
Hence, the correct answer is:
d. [tex]\(30 ; 70\)[/tex].
